Alarm.



' Patented Apr. 22, I902. A. B; COWLES.

ALARM.

(Application filed Nov. 29, 1901.)

(No Model.)

IN VE N TOR drf/zurji Cowl.

WITNESSES: afimw; 5

r ED TATES PATENT came.

ARTHUR B. .COWLES, OF RICHMOND, VIRGINIA, ASSIGNOR OF ONILIIALF ,TOERNEST A. IIOEN, OF RICHMOND, VIRGINIA.

ALARM.

SPECIFICATION formingpart of Letters Patent No. 698,392, dated April 221902. pplication filed November 1901I Serial No. 84,124. (No model.)

To all whom it nuty concern:

Be it known thatI, ARTHUR B. COWLES, a citizen of the United States, anda resident of Richmond, in the county of I-Ienrico and State ofVirginia, have invented certain new and truder the alarm will be at oncesounded and it consists in the means hereinafter fully illustrated anddescribed.

In the drawings which form a part of this specification,and in whichlikenumerals refer to like parts in the dilferent views, Figure I is alongitudinal section of the alarm. Fig. II is a longitudinal section ofthe alarm, showing a difierent arrangement of hammer. Fig. III is a viewof the alarm in perspective.

In the figures, 1 is a base-plate, in which are set the bell-post 2 andthe spring-post 3, and which is provided with a tongue 4, having in it aslot 5. Upon the post2 is mount ed the hell 6 in such a manner that itisfree to revolve. In the slot 5 is pivoted at 7 the arm 8, one end ofthe said arm terminating with the tongue i and its otherend 9 beingturned up to form a detent and engaging in a notch 10 in the rim of thehell 6. The bell is preferably provided with two or three notchesarranged at equal intervals on the edge of the bell to facilitate thewinding up of the latter. A compression-spring 11 encircles the top ofthe bell-post2 and having a fixed bearing in the head of the post 2presses down upon the hell 6. A spring 12, preferably a commonclock-spring, is secured by one end to the spring-post 3 and by itsother pieces of clock-spring. are set in a boss 21, which is keyed,pinned,

tongue 4 and the end of the arm 8. So long as this cap is in place thedetent 9 will be in line with the edge of the bell and so engage in thenotches 10. To the cap is secured a cord 15, the other end of which isconnected with a door, window, or other object. Beneath the base-plateis secured a spring 16, the free end of which presses upward against theouter end of the arm 8 and so tends to throw, the detent 9 out ofengagement with the notches 10.

17 is a stud having a projecting arm 18, which may be used, as shown inFig. III, to keep the arm Sdown and to prevent the alarm beingaccidentally sprung when not in use. When the alarm is set for use, thestud is turned so that the arm 18 does not project over the arm 8. i

In Fig. II 19 19 are the hammer-heads, which may be steel balls, andwhich are set on springarms 20 20, preferably madelof These ham mer-armsor shrunk on the bell-post 2. The hell 6 is provided on its innersurface with one or more projections 22 22, which projections when thebell revolves strike against the hammer-heads 19 19 and so cause thebell to sound. In Fig. I ahammer-head 19 is shown arranged beneath theedge of the bell. With this arrangement the hammer-head strikes againstthe vertical edges of the notches 10 in the edge of the bell.

The base-plate 1 is provided with a hole 23 to admit of the alarm beinghung upon a nail in some fixed object or of its being secured thereto bymeans of a cord.

To set the alarm in connection with a door or window, the bell is woundup, the alarm is secured to some fixed object, the cap is put on, asshown in Figs. II and III, and the free end of the cord 15 is secured tothedoor or to the window-sash, as the case may be. Should the door, orin the latter case the window, be opened, the cord 15 will pull thecaplet away, and so release the arm 8, which, under the action of thespring 16, will flyup, throwing the detent 9 out of engagement with thenotch in the edge of the bell. The latter will then, under the action ofthe spring 12, cause the bell to revolve, and the projections 22 22 onthe bell striking the hammer-heads 19 19 the bell will ring. To set thealarm on a stair- Way, the alarm is attached to one sidethe banisters,for instance-and the free end of the cord 15 to the other side at such aheight that the cord stretched across the stairs will be caught by thefoot of any intruder walking up the stairs. The alarm may be arranged ina similar manner across a hall or corridor.

'Having now described my invention, what I claim, and desire toprotect-by Letters Patent of the United States, is

1. In a bell-alarm, the combination of a rotatably-supported bellprovided with striking parts, a hammer supported on an elastic arm, amotor-spring for rotating the bell, a detent engaging in a notch in thebell to hold it when wound up, means for holding the detent in thenotch, and means for throwing the detent out of the notch to release thebell when the means for holding the detent in engagement with the notchis removed.

2. In a bell-alarm, the combination of arot-at-ably-supported bellprovided with striking parts, means for revolving the bell, anelastically-supported hammer, an arm 8 provided with a detent end 9engaging the bell to hold it when wound up, a cap 14 to hold the det-ent9 in engagement with the bell, and a spring 16 arranged to throw thedetent 9 out of engagement with and so release the bell when the cap 14is removed.

3. In a bell-alarm, the combination of a base-plate, a bell-post, a bellrotatably mounted on the bell-post and provided with striking parts, anelastically-mounted hammer lying in the path of the said striking parts,a spring 12 fixed at one end and so attached by its other end to thebell that when it is wound up it will revolve the bell, an arm 8 pivotedV to the base-plate and terminating at one end in a detent 9 adapted toengage in a notch in the edge of the bell, removable means for keepingthe arm in position, and a spring 16 arranged to throw the detent out ofengagement with and so release the bell when the means for keeping thearm in position is removed.

4. In abell-alarm,the combination ofabaseplate, a bell-post, a bellrotatably mounted on the bell-post and provided with striking parts, anelastically-mounted hammer lying in the path of the said striking parts,a spring 12 fixed at one end and so attached by its other end to thebell that whenit is wound up it will revolve the bell, an arm 8 pivotedto the base-plate and terminating at one end in a detent 9 adapted toengage in a notch in the edge of the bell, removable means for keepingthe arm in position, a spring 16 arranged to throw the detent out ofengagement with and so release the bell when the means for keeping thearm in position is removed, and a spring 11 to hold the bell inengagement with the detent 9 when the alarm, is set.

5. In a bell-alarm, the combination of a rotatably-supported bellprovided with projecting striking parts, a hammer adapted to come incontact with the said striking parts as the bell revolves, means forrotating thebell, means for holding thebell, and means for releasing thebell.

Signed at Richmond, in the county of Henrico and State of Virginia, this21st day of November, 1901. p

ARTHUR B. COWLES. VVi tnesses:

H. J. DUNBAR, O. H. H. TURNER.

